Table of Contents
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Atmospheric ECO-MAGNUM SERIES
Manual 238-50628-00A
Ultra Low NOx Gas Water Heaters
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
U175S*RN
U2XR75S*RN
U100T*RN
U75T80R*N
U100T88R*N
(*) Denotes Warranty Years
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Table of Contents
Related Manuals for Bradford White U2XR75S RN Series
Summarization of Contents
Atmospheric ECO-MAGNUM Series
Models Covered by This Manual
Lists specific water heater models covered in the manual.
Service Manual Overview
Troubleshooting and Service Instructions
Provides guidance for troubleshooting and servicing the water heater.
Important Safety Precautions
Fire and Explosion Prevention
Warns about hazards from flammable materials and gas storage.
Gas Leak Detection and Immediate Actions
Instructs on responses to gas leaks and safety during operation.
Hydrogen Gas and Hot Water System Safety
Advises on precautions for potential hydrogen gas build-up.
Introduction to the Manual
Purpose and Target Audience
Explains the manual's intent for qualified service personnel.
Tools Required for Service
Essential Diagnostic and Repair Tools
Lists necessary tools like multimeters, wrenches, and specialized probes.
Service Procedure I: Burner and Inner Door/Gasket
Inner Door Removal Procedure
Step-by-step guide for removing the inner door and burner assembly.
Inner Door Gasket Replacement Procedure
Instructions for replacing the gasket on the inner door and burner door.
Inner Door Re-installation with Gasket
Steps for correctly re-installing the inner door and gasket assembly.
Service Procedure II: Thermopile Testing and Replacement
Closed Circuit Thermopile Testing Method
Method for testing thermopile output using a multimeter in a closed circuit.
Open Circuit Thermopile Testing Method
Method for testing thermopile output using a multimeter in an open circuit.
Thermopile Replacement Steps
Step-by-step guide for replacing a faulty thermopile.
Service Procedure III: Pilot Assembly
Pilot Assembly Inspection, Cleaning, and Replacement
Details on inspecting, cleaning, and replacing the pilot assembly.
Service Procedure IV: Igniter and Electrode
Igniter and Electrode Testing and Replacement
Procedure for testing and replacing the igniter and electrode circuit.
Service Procedure V: Gas Control
Manifold Pressure Testing Procedure
Guide for testing manifold gas pressure using a manometer.
ECO (Energy Cut Out) Testing and Reset
Explains testing and resetting the ECO device on the gas control.
Gas Control Replacement Procedure
Detailed instructions for removing and installing a new gas control unit.
Service Procedure VI: Burner Operation
Main Burner Inspection and Cleaning Procedure
Procedures for inspecting and cleaning the main burner and its components.
Burner Cleaning and Reassembly Steps
Specific steps for cleaning the burner screen, venturis, and manifold.
Service Procedure VII: Resettable Thermal Switch
Resettable Thermal Switch Continuity Testing
How to test the switch's continuity to check for proper operation.
Resettable Thermal Switch Replacement Procedure
Step-by-step guide for replacing the resettable thermal switch.
Service Procedure VIII: Dip Tube and Anode
Dip Tube Inspection and Replacement Procedure
Instructions for inspecting and replacing the water dip tube.
Anode Inspection and Replacement Procedure
Guide for inspecting and replacing the water heater anode rod.
Parts List
75-Gallon Models Parts Diagram
Illustrated list of parts for the 75-gallon model.
100-Gallon Models Parts Diagram
Illustrated list of parts for the 100-gallon model.
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